Improvement in door-locks



B. WHITSON & S. C. HUSH, J:-. 4

DOOR-LOCK.

THE GRAPHIC COJLY UNITED VS'IIrrEs PATENT OFFICE.

BENJAMIN WHITSON AND SAMUEL O. HUSH, JR., OF BALTIMORE,

IMPROVEMENT IN DOOR-LOCKS.

Specification forming part of Letters Patent No. 184,680, dated November2l, 1876; application led July 17, 187.6.

To all whom it may concern:

Be it known that we, BENJAMIN T. WHIT- soN and SAMUEL G. Husn, Jr., bothof the city of Baltimore and State of Maryland, have invented certainnew and useful Improvements in Door-Locks, of which the following is aspecification; and we do hereby declare that in the same is contained afull, clear, and exact description of our said invention, referencebeing had to the accompanying drawing, and to the letters of referencemarked thereon.

This invention relates to certain improvements in that class ofdoor-locks in which a series of bolts are employed and adapted tobeprojected in the locking operation radially from the lookin gmechanism by means of keys, and made to enter suitable keepers securedto the door-frame, as hereinafter fully described.

In the description of a lock embodying our invention which follows, duereference must be had to the accompanying drawing, forming a part ofthis specification, and in which- Figure 1 is a view of a door and framehaving our improved lock attached thereto. Fig. 2 is an enlarged view ofparts of the lock, with the outer case removed. Figs. 3, 4, and 5 areviews of one of the keepers. Fig. 6 is a sectional View of Fig. 2 online w y. Figs. 7 and 8 are, respectively, views of the main andauxiliary keys.

Similar letters of reference indicate similar parts in al1 the figures.

A is the door, and B the door-frame. C is the bottom plate of the lock,and D the case of the same. E E are bolts, four of which are shown inthe drawing, adapted, when forced out by the locking mechanism, to enterthe keepers E'. One of the keepers El is fitted with devices,hereinafter described, whereby the bolt, when forced therein, is securedagainst withdrawal by means of the keys alone. The parts of the bolts Ewithin the lock-case are offset and provided with teeth, which engagewith similar teeth on the central hub F, or that part of the lock intowhich the main key is inserted. This main key, which is represented byF', is slotted and adapted to pass over a pin, a, extending across thecentral opening in the hub F, whereby the movement of the key in turningis transmitted to the lock mechanism.

The formation of the keeper before alluded to, as adapted to retain thebolt inserted therein, is illustrated in Figs. 3, 4, and 5. This keeperis provided with a spring-bolt, b, the outer end of which passes into aslot or recess near the end of the bolt E as the same is brought incontact with it. The disconnection of the spring-bolt b from the bolt Eis accomplished by hand through the medium of an arm, c, extending fromthe spring-bolt b through the casing of the keeper. The arm c is notchedto admit of the engagementtherewith of a spring-arm, d, when. thespring-bolt is forced down and ont of the notch in the bolt E by meansof the said arm. When the bolt E has passed a considerable distance intothe keeper the end thereof comes into contact with a pin, f, on theupper side of the spring-arm, and by forcing the arm back thespring-bolt is released.

By referring to Fig. 2 it will be seen that one end of one of the boltsE, when forced out in the locking operation, is held by a spring, g, andthat before the said bolt, which moves in connection with the others,can be drawn back the said spring must be moved aside. This movement isaccomplished by means of the key G, which is inserted through a curvedslot in the lock-case. The keepers are secured to the door-frame, and,as an additional security against removal, are held to the brickwork Hby pins or other suitable devices.V

The devices being locked, the unlocking operation is as follows: Thekeys are inserted in their respective places, and the key G turned insuch position as to move back the spring g. The projecting end of thespringbolt b is then pressed in, after which the bolts E are withdrawnfrom the keepers by a partial revolution of the key F.

In the locking operation, the small key being removed, the large keyonly is used, the fastening of the end of the bolt, as before described,and the engagement of the spring g with the end of one of the bolts,being alitomatic in operation.

This invention is specially designed to prevent the forcing open ofdoors from the outside thereof by means of bars, the door being securedat as many points as there are bolts employed. It will be seen that thekeys and the4 other locking and unlocking devices are operative only.from the inside of the door.

Having thus described our invention', what we claim as new, and Wish tosecure by Letters Patent of the United States, is-

l. Anoset toothed` bolt, E, projected and retracted by means of thetoothed hub F, as described, combined with the spring g, which, when thesaid bolt is projected, springs over the base thereof and locks thesame, substan` tially as specified.

2. In combination with one of the bolts E, notched near to the outer endthereof, as

shown, the keeper E', provided with the springbolt b, adapted to beheld, whenpressed down,

by means of the spring-arm d, and released through the medium of the pinf, projecting from the said spring-arm, substantially as and for thepurpose set forth.

In testimony whereof we have hereunto slibsoribed our names this 7th dayof July, ingthe year of our Lord 1876.

BENJAMIN fr. WHrrsoN. SAMUEL o. HUsH, JR.

Witnesses: WM. T. HOWARD,

THos. MURDOCH.

